Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b678843bb3576b1…

MALICIOUS

PDF

81.5 KB Created: 2021-09-15 10:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 309792055b8bd2f989017d220d3c1bc0 SHA-1: 089335d574b88f38c917d4057dcbd55f2df3bd9c SHA-256: 2b678843bb3576b1fe795dee71e3222071051cd6b414fa4792dca1e928bfe8a6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users into downloading further malicious content. No scripts were extracted, but the presence of numerous suspicious URLs points to a pattern of distributing potentially harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://drafthe.ru/uplcv?utm_term=download+zombie+derby+2+mod+apk PDF link annotation
    • http://fernandopelosini.it/userfiles/files/zapitakavoderukafigumus.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/55950959414.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613273461d86d---28232790911.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/e5cp8culs4b46a9c83844hc3k9/63255635311.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210910195018.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/o072p4p05gl7bghcltqiujtbc3/dinekewinasu.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/3iltp0ffe684t5vp4evqnmnfq2/tipetakevovo.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315b6ea63a0---voxelapirosetomuxo.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/34778589634.pdfIn PDF document text
    • http://expresskaliski.info/file/7235126354.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/85935335420.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/kusupupidugimaz.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/suromoditatogi.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/67127040898.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/walevepedet.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/totigudon.pdfIn PDF document text
    • http://potya.com/32257952526.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16135e85f08474---44251732395.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/sogejisukezorukapo.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/26902608847.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/dofokidojetixik.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/fikowefapikenijijuxidula.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/34430361812.pdfIn PDF document text
    • https://lapdonline.org/file/duxosa.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB5 10900 bytes
SHA-256: 49244df9585e26d4f151e3f0dc223e12a84a56a067a8437bece422715480f771
font_01_sfnt_off0000e6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C0 21540 bytes
SHA-256: 9994b9a5f2a362a3c2aac0dd39d23ea6077e7442a4038f4edd8a511972c4d6ea
font_02_sfnt_off00011eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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